Sound box of gramophones



. A. F. R. COTTON.

SOUND BOX O F GRAMOPHONES. APPLICATION FILED NOV-23, I921- 1,409,047.v Patented Mar.7,1922.

Fig] F192 ":1 4 WW) M UNITED STATES PATENT OFFICE.

SOUND BOX OF GRAMOPHONES.

Application filed November 23, 1921.

To all whom it may concern:

Be it known that I, ARTHUR FREDERICK RICHMOND CO'ITON, a subject of the King of England, residing at 9 Weatherby Gardens,

' South Kensington, in the county of London,

England, have invented certain new and useful Improvements in Sound Boxes of Gramophones, of which the following is a specification.

This invention relates to gramophones and the like, and more particularly to the soundboxes of such instruments.

The invention has for object to provide improved means for controlling the stylus arms or levers of gramophone sound-boxes.

According to this invention, the stylus lever is controlled by one or more springs constructed of whalebone; this non-resonant material has the advantage of possessing a laminated structure, which enables it to give better results than I have been able to obtain from hard rubber, horn and other materials of a like nature.

The stylus arm may be arranged in an desired position according to the type of lever employed, and the whalebone is prefer ably employed in the form of one or more plates or leaves, secured by suitable clamps 0r clips.

The invention is hereafter described with reference to the accompanying drawings, in which Figure 1 is a front view of a sound-box according to one form of construction.

Figure 2 is a side view of the same.

Figure 3 is an inverted plan of Figure 2.

Specification of Letters Patent.

Patented Mar. 7, 1922. Serial No. 517,254.

In the construction illustrated the stylus lever a is provided with a transverse plate a, which is engaged by two parallel leafsprings 6 made of whalebone, secured upon the sound-box c. The stylus lever is adapted to pivot or rock upon knife-edges d and the outer ends 6' of thesprings are held down by screws e. The screws enter lugs 0 upon the sound-box, so that the pressure exerted upon the stylus arm by the springs may be adjusted by regulating the fixing screws 6. The centres of the springs may be connected to the stylus lever by screws f.

Having thus described my invention, what I claim is 1. A gramophone sound-box having a stylus lever, and means for controlling the movements of said lever, said controlling means being constructed of whalebone.

2. A gramophone soundbox, including a stylus lever, a pivotal support for said lever, and whalebone spring means for controlling the movement of said lever.

3. I11 combination with a gramophone soundbox, a stylus lever pivotally mounted upon said soundbox, and whalebone springs secured upon said soundbox, said springs engaging said lever and controlling its pivotal movements.

In testimony whereof I hereunto afiix my signature,

ARTHUR FREDERICK RICHMOND COTTON. Vitnesses VIo'roR F. FEENY, GYRIL J. FEENY. 

